package cn.itcast.jdbc.example;

import java.sql.*;

public class example01 {
    public static void main(String[] args) throws SQLException {

        Statement stmt = null;
        ResultSet rs = null;
        Connection conn = null;
        try {
            //1.注册数据库的驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            //2.通过DriverManager获取数据库的连接
            String url =
                    "jdbc:mysql://localhost:3306/jdbc" +
                            "?serverTimezone=GMT%2B8&useSSL=false";
            String username = "root";
            String password = "123456";
            conn = DriverManager.getConnection(url,username,password);
            //3.通过Connection对象获取Statement对象
            stmt = conn.createStatement();
            //4.使用Statement执行SQL语句
            String sql= "select * from users";
            rs = stmt.executeQuery(sql);
            //5.操作ResultSet结果集
            System.out.println("id  |   name   |   password"  + "|      email       |    birthday");
            while (rs.next()) {
                int id = rs.getInt("id");//通过列名获取指定字段的值
                String name = rs.getNString("name");
                String psw = rs.getNString("password");
                String email = rs.getNString("email");
                Date birthday = rs.getDate("birthday");
                System.out.println(id+"  |  " +name+" | "+psw+" | "+email+" | "+birthday);
            }
        }catch (ClassNotFoundException e){
            e.printStackTrace();
        }finally {
            //6.回收数据库资源
            if (rs != null){
                try {
                    rs.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                rs = null;
            }
            if (stmt!= null){
                try {
                    stmt.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                stmt = null;
            }
            if (conn != null){
                try {
                    conn.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                conn = null;
            }
        }

    }
}
